JP2020139948A - Method for calibrating measurement probe of gear cutting machine - Google Patents

Abstract

To calibrate a measurement probe of a gear cutting machine by using a workpiece.SOLUTION: Provided is a method for calibrating a measurement probe of a gear cutting machine, by using a workpiece received by a workpiece holder of the gear cutting machine. In the disclosed method, the measurement probe has a measurement probe tip which is movably disposed on a measurement probe base, and is capable of determining deflection of the measurement probe tip relative to the measurement probe base via at least one sensor of the measurement probe. Further, the measurement probe is capable of relatively traversing relative to the workpiece holder via at least two movable shafts of the gear cutting machine. The method includes rotating the workpiece via a rotary shaft of the workpiece holder, and further includes, in the case of a complete calibration, making the measurement probe traverse so that a touch point on a tooth surface of the measurement probe tip remains unchanged, by using the at least two movable shafts of the gear cutting machine.SELECTED DRAWING: Figure 8

Description

The present invention relates to a method of calibrating a gearing machine measurement probe using a workpiece, especially a gear.

Externals such as temperature fluctuations in a gear cutting machine where a measuring probe is installed to enable checking of workpieces manufactured in the machine (for example, tooth thickness check, pitch check, tooth profile check, tooth streak check). The effect can cause minor deformations in the panel, which makes these checks inaccurate. Therefore, in order to ensure that good test results are always obtained, the resulting change in the position of the measurement probe with respect to the tooth (hereinafter, simply referred to as the position of the measurement probe) is periodically determined and compensated by calibration. There must be.

The difference between the assumed position of the measurement probe and the actual position is referred to as a position error here. When the position error is zero, the measurement probe is fully calibrated. The correction of the position of the measurement probe determined by the method described in the present invention is referred to as position correction.

Determining the position of the measurement probe required for calibration can be performed on the measurement target, eg, the measurement block. However, making decisions directly on workpieces fixed in the panel, especially on gears, offers several advantages. In particular, the cost for the operator to install the measurement block in the panel, calibrate it, and then remove it again is eliminated. In gear cutting machines for the production of large workpieces, the transverse path for the measuring probe may not be sufficient to reach the measuring block. This can also be avoided by measuring on the work piece.

Patent Document 1 knows a method of calibrating a measurement probe of a gear cutting machine using a work piece, in which the tooth profile of the work piece is determined twice by different measurement steps. In the first measurement step, the measurement probe traverses tangentially while the workpiece rotates, while in the second measurement step it traverses non-tangentially or radially. The position error of the measuring head is determined and used for calibration by referring to the difference between the tooth profile gradient errors determined in each measurement step.

European Patent No. 2554938

An object of the present invention is to provide an improved method of calibrating a gear cutting machine measurement probe using a workpiece.

In the first aspect, the object is solved by the method of claim 1, and in the second aspect it is solved by the method of claim 2.

Each preferred embodiment of the present invention is the content of each dependent argument.

In the first aspect, the present invention is a method of calibrating a measuring probe of a gear cutting machine by using a workpiece received by a workpiece holder of the gear cutting machine, wherein the measuring probe is a measuring probe base. Including a measuring probe tip that is movably disposed above, the runout of the measuring probe tip with respect to the measuring probe base can be determined via at least one sensor of the measuring probe, and the measuring probe It is traversable relative to the workpiece holder via at least two moving axes of the gear cutting machine.
A step of traversing the measuring probe and / or the workpiece to a relative position where the tip of the measuring probe contacts the tooth surface of the workpiece.
The work piece is rotated through the rotation axis of the work piece holder, and the measuring probe is placed through the at least two moving axes of the gear cutting machine.
In the case of full calibration, the touch point on the tooth surface of the measurement probe tip remains unchanged, and in the case of full calibration, the runout or runout amount of the measurement probe tip is at least 1. To adopt and / or maintain one particular value
Steps to cross and
The step of determining the deviation of the runout of the tip of the measuring probe from the at least one specific value at at least one measurement point.
Includes a method comprising: determining at least one correction value for calibration based on the deviation.

According to the second aspect, the present invention is a method of calibrating a measuring probe of a gear cutting machine by using a workpiece received by a workpiece holder of the gear cutting machine, wherein the measuring probe is a measurement. Achievement of runout of the measurement probe tip with respect to the measurement probe base and / or runout of the measurement probe tip with respect to the measurement probe base includes the measurement probe tip that is movably arranged on the probe base. It can be determined via at least one sensor of the probe, and the measuring probe is traversable relative to the workpiece holder via at least two moving axes of the gear cutting machine.
A step of traversing the measuring probe and / or the workpiece to a relative position where the tip of the measuring probe contacts the tooth surface of the workpiece.
The work piece is rotated through the rotation axis of the work piece holder, and the measuring probe is placed through the at least two moving axes of the gear cutting machine.
In the case of complete calibration, the touch point on the tooth surface of the measuring probe tip remains unchanged, and the runout or runout amount of the measuring probe tip adopts at least one specific value and / Or to maintain
Steps to cross and
At at least one measurement point, the deviation between the actual positions of the rotation axis of the work piece holder and / or the at least two moving axes of the gear cutting machine and these positions in the case of full calibration. Steps to decide and
Includes a method comprising: determining at least one correction value for calibration based on the deviation.

In the above two aspects of the present invention, unlike Patent Document 1, the tooth profile angle and / or tooth profile angle deviation is not measured. Further, the movement in the tangential direction with respect to the base circle at the tip of the measurement probe is not performed. Rather, the center of the tip of the measuring probe (excluding the measured deviation if possible) moves in a circular orbit. This provides a fairly simple method and allows for more comprehensive calibration.

Suitable embodiments of the method according to the first aspect and the second aspect are described in detail below. Unless otherwise stated, preferred embodiments can be used to develop both aspects.

Preferably, the present invention can be performed without the need for a reference object such as a reference measurement block. That is, calibration is performed entirely through the dentate work piece.

The tooth portion of the work piece can be arbitrarily selected. In particular, the tooth portion of the workpiece may be an internal or external tooth portion (beveloid tooth portion) of a linear or spiral dentition which may have a cylindrical design or a conical design. The teeth may be symmetrical or asymmetric. That is, the tooth profile angles of the left and right tooth surfaces may be different, but need not be different. The tooth profile can be arbitrarily selected, and in particular, it may be an involute.

The calibration method according to the invention is preferably performed completely automatically in the manufacturing cycle.

In the method according to the first aspect, a measurement probe capable of providing the control unit with the runout of the tip of the measurement probe, that is, a measurement probe suitable for scanning measurement is used.

On the other hand, for the execution of the method according to the second aspect, it is also possible to use a measurement probe that can simply output the degree of achievement of a specific runout with respect to the measurement probe base at the tip of the measurement probe, that is, a measurement probe suitable only for switching measurement. it can.

According to the present invention, it is possible to use a measurement probe that can output only the amount of runout (the switching probe can output only the presence or absence of contact). However, in addition, a measurement probe capable of outputting in the tilt direction can also be used. However, this information is not absolutely necessary.

According to a possible embodiment of the present invention, the deviation is determined for a plurality of measurement points, and the at least one correction value is determined based on the plurality of deviations. In particular, the deviation curve can be determined over a plurality of measurement points.

According to a possible embodiment of the invention, the deviation and / or the deviation curve is determined for various calibration errors in order to determine at least one correction value for the calibration. The deviation and / or the theoretical curve of the deviation is compared.

According to a possible embodiment of the present invention, the deviation of the workpiece in contact with the first tooth surface is determined by at least one first measurement operation and the second, preferably opposite side of the workpiece. The deviation in contact with the tooth surface is determined by at least one second measurement operation. Preferably, the deviation is determined for both tooth surfaces at several measurement points, respectively. Measurements on the two tooth surfaces provide additional information for calibration.

According to a possible embodiment of the present invention, correction values are determined for at least two moving directions and / or moving axes, preferably the moving directions and / or moving axes to the rotating shaft of the workpiece holder. It can be moved in a vertical plane. Preferably, at least two measurement actions are performed on them, each of which determines the deviation.

Compared with the prior art, it is possible to obtain the advantage that not only the error in the first direction but also the error in the second direction can be corrected by the two measurements. The two calibration paths are preferably deployed on two different tooth surface sides.

According to a possible embodiment of the present invention, the rotation of the work piece is carried out via the rotation axis of the work piece holder, and the crossing of the measurement probe is carried out via at least two moving axes of the gear cutting machine. Simultaneously and / or continuously. In particular, such a procedure can be adopted when the measuring probe can output the runout of the tip of the measuring probe with respect to the base of the measuring probe.

According to another possible embodiment of the present invention, the rotation of the workpiece is carried out via the axis of rotation of the workpiece holder and the traversal of the measurement probe is at least two movements of the gearbox. Alternately and / or intermittently across the shaft. Such a method can be adopted when the measuring probe can simply output the degree of achievement of runout of the tip of the measuring probe with respect to the base of the measuring probe, that is, when it is suitable only for switching measurement.

According to a possible embodiment of the invention, to preselect a touchpoint for calibration and / or to take into account changes in tolerance and / or tooth profile around the touchpoint when determining correction values. By tracing the tooth surface to be checked, the change in tolerance on the tooth surface and / or the tooth profile is determined. In particular, a touch point with as little change in tolerance on the tooth surface as possible can be selected so that the deviation from the target shape on which the calculation is based is as small as possible.

According to a possible embodiment of the present invention, the radius and / or the workpiece holder where the touch point is located, depending on the tooth profile and / or the gear cutting machine and / or the measurement probe of the workpiece. The range of rotation angles of the axis of rotation is traced and determined. In particular, the determination is made so that it can be measured over the largest possible rotation angle range and / or with certain accuracy.

According to a possible embodiment of the present invention, the tip of the measuring probe has a spherical shape.

According to a possible embodiment of the present invention, the gear cutting machine includes a machining head that is traversable to the workpiece holder via the at least two moving axes, and the measuring probe and tool holder are said. It is placed on the processing head. Therefore, the moving axis of the machining head can also be used to traverse the measuring probe.

In a possible embodiment of the invention, the measuring probe can also be traversed in whole or in part through other moving axes other than the machining head, including the tool holder.

According to a possible embodiment of the present invention, the at least two moving axes are linear axes. Preferably, these axes allow movement in a plane perpendicular to the axis of rotation of the workpiece holder. Preferably, both moving axes are calibrated by the method of the invention.

The present invention further comprises a gear cutting machine comprising a tool holder for receiving a workpiece and a measuring probe, wherein the measuring probe includes a measuring probe tip that is movably arranged on a measuring probe base. Achievement of runout of the tip with respect to the measurement probe base and / or runout of the tip of the measurement probe with respect to the measurement probe base can be determined via at least one sensor of the measurement probe, and the measurement probe is said to be said. Includes a gear cutting machine that is traversable to the workpiece holder via at least two moving axes of the gear cutting machine. The gear cutting machine includes a control unit configured to calibrate the measuring probe by the method described above.

In particular, the control unit includes a microprocessor and a non-volatile memory in which the program is stored. When the program is run on the microprocessor, the gearbox executes the method of the invention. The control unit can actuate the moving axis of the gear cutting machine and / or evaluate the signal and / or measurement data of the measurement probe.

According to a possible embodiment of the invention, the control unit is configured such that the method is performed fully automatically as part of a manufacturing cycle.

The present invention will be described in detail below with reference to the drawings and exemplary embodiments.

It is a schematic diagram of an exemplary embodiment of the method according to the present invention, and when the rotation axis of the workpiece rotates and the measurement probe crosses in synchronization with the rotation axis, the touch point between the tip of the measurement probe and the tooth surface is Shows the circular orbit to follow. It is a figure which shows an example which plotted the process of the measured value (21) and the calculated value (22) of the record of the probe runout during the calibration measurement on the left tooth surface over the rotation angle of a workpiece. It is a figure which shows an example which plotted the process of the measured value (31) and the calculated value (32) of the record of probe runout during the calibration measurement on the right tooth surface over the rotation angle of a workpiece. It is a schematic diagram which shows the actual process of the touch point in the presence of the position error (43) between the calculated touch point (41) and the tooth surface of the tip of the measurement probe. FIG. 5 is a schematic diagram showing a series of transformations (51-54) for calculating the position of a measuring probe. It is a figure which shows the exemplary embodiment with respect to the structure and operation mode of the measurement probe. It is a figure which shows the exemplary embodiment with respect to the structure and operation mode of the gear cutting machine according to this invention. It is a figure which shows the exemplary embodiment with respect to the processing head provided with the measuring probe used in a gear cutting machine.

An exemplary embodiment for the configuration and operating mode of the gear cutting machine according to the present invention is shown in FIG. FIG. 8 shows an exemplary embodiment for a machining head 73 with a measuring probe 74 that can be used in a gear cutting machine.

In this exemplary embodiment, the gear cutting machine comprises a workpiece holder 71 and a tool holder 72. The workpiece holder and the tool holder can be driven around these rotation axes C2 and B1 via the corresponding drive device.

The tool holder is arranged on a machining head 73 that is traversable to the workpiece holder via a moving shaft. In this exemplary embodiment, a first linear axis Y1 is provided through which the tool holder 72 can traverse in a direction perpendicular to the rotation axis C2 of the workpiece holder to change the center-to-center distance. Is. Further, a second linear axis Z1 is provided through which the tool holder 72 can traverse in a direction parallel to the rotation axis C2 of the workpiece holder. Further, a third linear axis V1 is provided through which the tool holder 72 can traverse in a direction parallel to its own rotation axis B1. The adjustment between the linear axis V1 and the tool holder 72 can be changed via the swivel axis A1 extending parallel to the Y1 axis.

In this exemplary embodiment, the workpiece holder 71 is placed on the tool post 75. The tool base 75 mounts a tool stand 76 that can be crossed linearly by the Y1 axis. A carriage traversable via the shaft Z1 is arranged on the tool stand, and a machining head provided with the tool holder 72 is arranged on the carriage via the A1 shaft and the V1 shaft.

The gear cutting machine can be, for example, a hobbing machine and / or a hobbing machine. However, the present invention can be used with any other gear cutting machine.

FIG. 8 shows an exemplary embodiment for the machining head 73. A measuring probe 74 is arranged on the processing head. The measurement probe includes the measurement probe base 83, and the deflection of the measurement probe tip portion of the measurement probe 74 with respect to the measurement probe base 83 can be determined via at least one sensor.

Through the measurement probe base 83, the measurement probe 74 is arranged on a swivel arm 81 that is swivelable from a stationary position to a measurement position and vice versa via a drive device 82.

Definitions of directions X, Y and Z selected according to the present specification can also be made from FIG. 1, where Z is orthogonal to X and Y, and these three axes form a right-handed system. To do. The Z-axis extends parallel to the rotation axis of the tooth portion (workpiece rotation axis). The C-axis here refers to the rotation axis of the workpiece holder, and rotates the workpiece around the workpiece rotation axis. The X, Y and Z axes refer to the board axes that traverse the measuring probe in the directions X, Y and Z with respect to the tooth portion. These axes do not necessarily have to be physical axes. These movements can also be achieved by interpolating two or more axes.

In particular, the movement in the Y direction can be realized via the Y1 direction in this exemplary embodiment, and the movement in the X direction is the A1 axis whose V1 axis is parallel to the X direction in this exemplary embodiment. This can be achieved through the V1 axis only at one position and by superimposing the movements of the V1 and Z1 axes at other positions. However, in another embodiment of the gear cutting machine, it is also possible to include an X1 axis that is always adjusted parallel to the X direction. This is possible, for example, when the X1 axis bears the A1 axis and is therefore not swiveled by the A1 axis.

The measurement probe tip 61 at the end of the tracer pin 62 of the measurement probe 74 is preferably a sphere (measurement probe sphere), for example a ruby sphere. FIG. 6 shows the configuration of possible variants of the scanning measurement probe that can be used here.

In the method according to the present invention, a measurement probe suitable for scanning measurement is preferably used. That is, it is a measurement probe that can provide the control unit with the runout of the tracer pin and / or the tip of the measurement probe. One variant of the invention also provides for the use of rather simply a measurement probe suitable for switching measurements. Further, the measurement probe can be distinguished by whether only the amount of runout can be output (whether the switching probe can output only the presence or absence of contact) or whether the tilt direction can also be output. The method presented here can also be performed with a measurement probe that cannot output the tilt direction. In the following, this method will be described for such a measurement probe.

In the first exemplary embodiment, the basic order of the methods is as follows.

The tip of the measuring probe is moved into the gap between the teeth to a specific depth (for example, the center of the tooth profile).

The C-axis (workpiece rotation axis) is then rotated until the tracer pin reaches the desired runout, preferably half of the possible runout. This situation is shown on the right side of FIG.

Next, X, Y and so that the touch point and probe runout at the tip of the measuring probe on the tooth surface remain the same when the C-axis is continuously rotated and fully calibrated. The Z axis is crossed synchronously. The touch point between the tip of the measuring probe and the tooth moves on a circular orbit whose center is on the rotation axis of the tooth.

During this rotation, the runout of the tracer pin is recorded over the C rotation angle at several discrete points, especially at as many discrete points as possible.

This procedure is repeated for the other tooth surface to obtain a record of runout with respect to a point on the left tooth surface and a record of runout with respect to a point on the right tooth surface. An example of such recording is shown in FIG. 2 (curve 21) for the left tooth surface and FIG. 3 (curve 31) for the right tooth surface.

If fully calibrated and both the measuring probe and the axis of the disc are correct, the recorded runout of the probe for all C positions with respect to each of the two tooth surfaces is constant at each probe start runout. The touch points of the tip of the measuring probe with the two tooth surfaces remain unchanged.

If not fully calibrated, the actual touchpoint (42) on the tooth surface of the tip of the measurement probe at the start of measurement does not correspond to the calculated touchpoint (41). The calculated C angle is assumed at the start of measurement to reach the desired runout of the tracer pin and does not reach exactly. In addition, the runout of the tracer pin and the touch points on the tooth surface change as it traverses the calculated motion path (43). Plotting the runout of the tracer pin through the C position gives one curve for each tooth surface. Therefore, these curves are called runout curves, and are shown in FIG. 2 for the left tooth surface and in FIG. 3 for the right tooth surface as an example. In general, these recorded runout curves have constant noise, which is due to errors in the measurement probe and board axes.

Calculate what the runout curve looks like for a particular error in the X and Y directions and for a particular angular deviation of the two C start positions using a computational axis path and a series of coordinate transformations. And / or can be simulated. At that time, the already calculated X, Y and Z positions are used, and the error is added in the X and Y directions. Further, C angle correction is applied to both paths. Next, the runout of the tracer pin is calculated using the corresponding coordinate transformation. Touchpoints are also unknown. In this way, a series of curves can be obtained for runout on the left and right tooth surfaces. Here, the error in the X and Y directions and the C angle correction of the left and right tooth surfaces are free parameters of this series of curves.

A standard is used that indicates how far the calculated runout curve [22/32] for the left and right tooth surfaces is from the recorded runout curve [21/31] for the left and right tooth surfaces. For example, a useful standard is the Lp standard (or its discretized form). By applying the compensation calculation, the runout curves for the left and right tooth surfaces can be found from a series of curves (and thus also errors in the X and Y directions), which are the closest approximations to the recorded runout curves.

For this purpose, certain errors in the X and Y directions as well as the C angle correction are varied to determine the minimum value of this standard. This can be achieved by a numerical optimization method (eg, gradient method or Newton's method with discrete differential coefficients). In the curves 22 and 32 shown in FIGS. 2 and 3, these curves, which are the positions where the minimum value is reached, are drawn from the series of curves.

When the probe is error-free and the gears are manufactured accurately around the touch points on the left and right tooth surfaces, the computational error in the X and Y directions is a negative number of the desired position correction, thus to calibrate the measuring probe. Corresponds to the correction value of.

Alternatively, a specific probe runout process may be used instead of the probe start runout that is constant over the measurement operation, which is the basis for the calculation of the movement performed.

On the other hand, in the second exemplary embodiment, a measurement probe that is simply suitable for switching measurements can also be used. That is, the measured probe switches from the "non-contact" state to the "contact" state due to the reliably identified runout.

For such measurement probes, the procedure can be similar to the method described above.

In a few small steps, the tip of the measuring probe is alternated, then the workpiece is rotated until contact occurs.

Changes in the position of the tip of the measurement probe are achieved by traversing the X, Y and Z axes so that the touch points of the tip of the measurement probe on the tooth surface remain the same when fully calibrated. At this time, the rotation axis of the workpiece is surely rotated by the specified angle difference. The corresponding calculation is performed in the same manner as above.

If not fully calibrated, the particular angular difference does not correspond to the angular difference that covers the probe contact. Differences in these angular differences are recorded for measurements on the left and right tooth surfaces over position C.

Here, a series of curves can be simulated for the angle difference according to the error at the X and Y positions at the first contact on the left and right tooth surfaces and the C angle correction. The parameters are now determined to reach the minimum recorded angle difference measured. Next, the correction value is determined from now on.

Alternatively, the workpiece may be rotated alternately and then the position of the tip of the measuring probe may be traced until contact occurs. In this case, the contact position of the probe can be recorded and evaluated.

The following additional aspects are considered in both variants of the method of the invention.

The range of C positions that can be used in calibration is limited by the following factors:

For a specific C angle, the angle α_NT between the normal to the tooth surface at the touch point of the tip of the measuring probe and the tracer pin can be calculated. If α_NT exceeds 90 °, collisions between the tracer pin and the calibrated tooth surface can occur. Some measurement probes have a lower limit for α-NT, below which the measurement becomes inaccurate. From the limit of the range for α_NT, the limit for the C range can be calculated.

For a specific board, there may be a limit to how far the measuring probe can traverse in the X direction. As a result, there is a limit to how far the C-axis can rotate.

A situation may occur in which the tracer pin collides with the tooth surface on the opposite side of the measurement. Therefore, the C range must be selected so that this does not occur.

All of the above constraints on the C range of calibration depend on how the depth and / or radius of the touchpoint position between the tooth surface and the tip of the measuring probe is determined. The larger the C range crossed during calibration, the less noticeable the probe error in position correction. Therefore, prior to the kinematic calculation, it is possible to provide a step of calculating the radius at which the C range is maximized and thereby selecting an appropriate radius.

How the touch points on the tooth surface change when determining what the runout curve looks like for a particular error in the X and Y directions and for a particular angular deviation of the two C start positions (43). Is also calculated, and it must be assumed that a given tooth is manufactured accurately. The larger the position error, the larger the movement of the touch point with the tooth surface at the tip of the measurement probe. The more accurate the tooth fabrication around the calculated touch point, the better the calculated calibration correction.

Therefore, in one possible embodiment, the preceding step searches for a point with as little change in tolerance on the tooth surface as possible around a small measurement point on the tooth surface by tracing the tooth surface or tooth profile to be checked. Can include that.

Depending on the type of tooth and the configuration of the measurement probe, changes in the moving portion can be drawn by a series of coordinate transformations (51-54) as shown in FIG.

Depending on the type of tooth to be measured and the desired radius (55), the touchpoint of the measuring probe is determined (eg, via the equation of the involute of a circle) (conversion 51).

The touch point is rotated according to the C position (56) (conversion 52).

The center of the measuring probe tip is reached by displacing from the touch point in the direction of the normal vector to the tooth surface by the radius of the measuring probe tip (conversion 53).

Depending on the configuration of the measuring probe, the measuring probe is placed (57) X, Y and Z so that the runout of the tracer pin (58) is the desired runout and the tip of the measuring probe is in the desired position. It is possible to determine how to traverse the axis (transformation 54).

Here, a more detailed analysis is performed on the specific measurement probe shown in FIG.

The tracer pin (62) is on the face gear (63). When the tracer pin swings, the face gear tilts upward on the side opposite to the contact side (see the image on the right side of FIG. 6). Hereinafter, the plane on which this inclination occurs is referred to as a recoil plane. In the image on the right side of FIG. 6, this is an image plane. The adjustment of the fulcrum (64) and the recoil plane depends on the direction of runout.

The relevant transformation consists of a displacement from the center of the measuring sphere to the tilt-dependent fulcrum and another displacement to the center of the face gear (tracer pin mounting point).

The measuring probe is configured such that the spring always pushes the tracer pin back so that the tracer pin runout is as small as possible. As a result, the condition that the normal vector at the touch point on the scanning surface is perpendicular to the normal vector of the recoil plane is added.

This results in additional equations that need to be solved both when calculating the kinematic path and when calculating the runout for a given position error.

Therefore, in the calculation of the kinematic path, there are four equations (three equations from the coordinate transformation and the above additional conditions) and four unknowns, X, Y and Z positions and tilt directions for each C position. ..

In the calculation of runout for a given position error, there are the same four equations for each C position, which are elucidated according to the two surface parameterized coordinates of the touch points on the tooth surface, the tilt direction and the runout of the tracer pin.

61 Measurement probe tip 71 Work piece holder 72 Tool holder 73 Machining head 74 Measurement probe 83 Measurement probe base

Claims (15)

A method of calibrating the measurement probe of the gear cutting machine using the work piece received in the work piece holder of the gear cutting machine.
The measuring probe includes a measuring probe tip that is movably placed on the measuring probe base.
The runout of the tip of the measuring probe with respect to the base of the measuring probe can be determined via at least one sensor of the measuring probe.
The measuring probe is traversable relative to the workpiece holder via at least two moving axes of the gear cutting machine.
A step of traversing the measuring probe and / or the workpiece to a relative position where the tip of the measuring probe contacts the tooth surface of the workpiece.
The work piece is rotated through the rotation axis of the work piece holder, and the measuring probe is placed through the at least two moving axes of the gear cutting machine.
In the case of full calibration, the touch point on the tooth surface of the measurement probe tip remains unchanged, and in the case of full calibration, the runout or runout of the measurement probe tip is To adopt and / or maintain at least one particular value
Steps to cross and
The step of determining the deviation of the runout of the tip of the measuring probe from the at least one specific value at at least one measurement point.
A method comprising the step of determining at least one correction value for calibration based on the deviation. A method of calibrating the measurement probe of the gear cutting machine using the work piece received in the work piece holder of the gear cutting machine.
The measuring probe includes a measuring probe tip that is movably placed on the measuring probe base.
Achievement of runout of the measurement probe tip with respect to the measurement probe base and / or runout of the measurement probe tip with respect to the measurement probe base can be determined via at least one sensor of the measurement probe.
The measuring probe is traversable relative to the workpiece holder via at least two moving axes of the gear cutting machine.
A step of traversing the measuring probe and / or the workpiece to a relative position where the tip of the measuring probe contacts the tooth surface of the workpiece.
The work piece is rotated through the rotation axis of the work piece holder, and the measuring probe is placed through the at least two moving axes of the gear cutting machine.
In the case of full calibration, the touch point on the tooth surface of the measuring probe tip remains unchanged, and the runout or runout amount of the measuring probe tip adopts at least one specific value. / Or to maintain
Steps to cross and
At at least one measurement point, the deviation between the actual positions of the rotation axis of the work piece holder and / or the at least two moving axes of the gear cutting machine and these positions in the case of full calibration. Steps to decide and
A method comprising the step of determining at least one correction value for calibration based on the deviation. The deviation is determined for multiple measurement points and
The at least one correction value is determined based on the plurality of deviations.
The method of claim 1 or 2, preferably the deviation curve is determined over a plurality of measurement points. The deviation and / or the deviation curve is a plurality of theoretical deviations and / or theoretical curves of the deviation determined for various calibration errors in order to determine at least one correction value for the calibration. The method of any of claims 1 to 3 to be compared. Deviation in contact with the first tooth surface of the workpiece in at least one first measurement motion, and the second, preferably opposite tooth surface of the workpiece in at least one second measurement motion. The method according to any one of claims 1 to 4, wherein the deviation in contact with is determined. Correction values are determined for at least two movement directions and / or movement axes.
The method according to any one of claims 1 to 5, preferably, wherein the moving direction and / or the moving axis enables the moving of the workpiece holder in a plane perpendicular to the rotating axis. The rotation of the work piece is performed via the rotation axis of the work piece holder.
The method according to any one of claims 1 to 6, wherein the crossing of the measuring probe is performed simultaneously and / or continuously via the at least two moving axes of the gear cutting machine. The rotation of the work piece is performed via the rotation axis of the work piece holder.
The method according to any one of claims 1 to 7, wherein the crossing of the measuring probe is performed alternately and / or intermittently via the at least two moving axes of the gear cutting machine. Tracing the tooth surface to be checked to preselect a touch point for calibration and / or to take into account changes in tolerance and / or tooth profile around the touch point when determining correction values. The method according to any one of claims 1 to 8, wherein the change in tolerance on the tooth surface and / or the tooth profile is determined by. The radius of the touch point and / or the range of the rotation angle of the rotation axis of the work holder is traced according to the constraints of the tooth profile and / or the gear cutting machine and / or the measurement probe of the work piece. The method of any of claims 1-9, which is determined. The method according to any one of claims 1 to 10, wherein the measuring probe tip has a spherical shape. The gear cutting machine includes a machining head that is traversable to the workpiece holder via the at least two moving axes.
The method according to any one of claims 1 to 11, wherein the measuring probe and the tool holder are arranged on the machining head. The method according to any one of claims 1 to 12, wherein the at least two moving axes are linear axes. A gear cutting machine equipped with a workpiece holder that receives the workpiece and a measuring probe.
The measuring probe includes a measuring probe tip that is movably placed on the measuring probe base.
Achievement of runout of the measurement probe tip with respect to the measurement probe base and / or runout of the measurement probe tip with respect to the measurement probe base can be determined via at least one sensor of the measurement probe.
The measuring probe is traversable relative to the workpiece holder via at least two moving axes of the gear cutting machine.
A gear cutting machine comprising a control unit configured to calibrate the measuring probe by the method according to any one of claims 1-13. The gear cutting machine according to claim 14, wherein the control unit is configured such that the method is performed completely automatically as part of a manufacturing cycle.